The sex ratio between male and female is not the same.
Basically male genetic information are carried by Y chromosome thus does not contain active genes. Unlike female has more of active genes on their sex chromosomes. Let us think how does man passing their genetic information to the next generation. Well, the 78Y genes has made a significant revolution in human being which leads to the existence of human male generations. The Y chromosome is repetitive because of the presence of 78 Y genes. As mentioned Y chromosome always consider as empty of genetic information as they have lack of genetic information to pass through; It plays a funny role in determining male sex in humans. It is obvious the one important genes which is 78Y makes the whole different of determining the male sex. The reason is 78 genes have active genes thus involves in sperm production. Just imagine, if there is no presence of 78Y genes then we will loose male generation eventually.